Respostas

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2014-06-20T12:56:38-03:00
(7x4y+2)-(2x-2y+5)
28y+2-2x-2y+5
26y+7-2x
1 5 1
(4x-y-1)-(9x+y+3)
(4x-y-1)-(9x+y+3)=4x-y-1-9x+y+3=3x+2-8y
(2a²-3a+6)-(-4a²-5a+6)